Mariner 40C 1986 (Yamaha twin carb) pump base problem

[CraigDiver]

Just about to replace impeller and gaskets however, pump base (which I cannot afford to replace right now) looks in bad shape. There is a bit of casting missing as shown in pic which is allowing water to pass from inlet through to outlet and externally. I intend to fix this with a metal repair compound.

What are the two relief slots for, it look like it allows water to travel between pump outlet and external - will this not have an adverse effect on water pressure to powerhead?

I have noticed many of the newer models have plastic parts rather than this cast aluminium/alloy one - is there a plastic replacement?

Any advice much appreciated (yes, I know buy a new base - but cannot afford and want to get motor running for a couple of months, then will replace with new part)

 

[Laddies]

Re: Mariner 40C 1986 (Yamaha twin carb) pump base problem

The relief slots as you call them are for drain down to keep the base from freezing in cold weather, yes we both know you need a pump base, but all us have been there as far as money so fill the whole void with what ever filler you plan on using and sand it off on a piece of glass with sand paper on it and lets hope for the best

 

[CraigDiver]

Re: Mariner 40C 1986 (Yamaha twin carb) pump base problem

The relief slots as you call them are for drain down to keep the base from freezing in cold weather, yes we both know you need a pump base, but all us have been there as far as money so fill the whole void with what ever filler you plan on using and sand it off on a piece of glass with sand paper on it and lets hope for the best

Thank you - great advice, the two locating pins are sitting proud of the casting preventing me sanding it down accurately on glass. Can these be removed, are they just push-fit?

CraigDiver

 

[Laddies]

Re: Mariner 40C 1986 (Yamaha twin carb) pump base problem

Yes, they normally can be pulled with dikes, lf not cheat it with a good file